EMI shielding films and EMC play an important role in the signal integrity of electronic devices. With the increasing problem of electromagnetic interference, the importance of EMI shielding film is becoming more and more prominent. Therefore, the study of EMI shielding film is of great significance in improving the electromagnetic compatibility of electronic equipment and ensuring its regular operation. In this article, we have discussed the basic concept, working principle, types and applications of EMI shielding film. Let's see them together!

What is EMI Shielding Film?

Before discussing EMI shielding films, we first need to understand the basic concepts of EMI (electromagnetic interference) and EMC (electromagnetic compatibility).

EMI shielding film is a special film that can effectively shield electromagnetic interference and improves EMC.

Working Principle of EMI Shielding Film

EMI shielding film blocks electromagnetic fields through its special shielding mechanism, which mainly depends on the conductivity and permeability of the shielding material. A material with good conductivity can form a continuous conductive layer, effectively preventing the penetration of electromagnetic waves. A material with high permeability can guide magnetic field lines around the shielding layer, thereby reducing electromagnetic interference.

In addition, at different frequencies, the shielding effect of the shielding film will be different. EMI in some frequency ranges may be more difficult to block, so more efficient shielding materials and designs are needed. Then, let’s look at its materials!

Types and Materials of EMI Shielding Film

According to the differences in structure, application, and performance, EMI shielding films can be divided into many types. There are the types by material:

In recent years, with the progress of materials science, some new or special EMI shielding materials and technologies have also been developed, like nanocomposites and multilayer structures.

Applications of EMI Shielding Film

EMI shielding films are widely used in various fields of electronic equipment, such as communications, computers, consumer electronics and so on. Through specific application cases, we can more intuitively understand the role and effect of EMI shielding film.

In smartphones, EMI shielding films are used to protect camera modules from interference from RF circuits.

In automotive electronics, it is used to protect in-car entertainment systems from interference from engines and other electronic devices.

Why is EMI Shielding Film Applied to Flex PCBs and Rigid-flex PCBs?

With the continuous development of electronic equipment, flex PCBs (FPCs) and rigid-flex PCBs (Rigid-flex PCBs) are widely used because of their excellent flexibility, reliability and integration. However, these types of PCBs face a more serious electromagnetic interference problem. Therefore, the application of EMI shielding film is highly important in the process of flex/rigid-flex PCB manufacturing.

PCBasic's flex PCB and rigid-flex PCB can also attach EMI shielding film to you according to your choice.

Conclusion

EMI shielding film protects the circuit from electromagnetic interference by forming a continuous conductive layer in the electronic device to weaken the electromagnetic field. And with the continuous development of electronic equipment, the application field of EMI shielding film is also expanding.